While I certainly don't doubt WDW makes much more than DLR, I'd be curious to see the numbers. I tried to do some digging but since I'm at work, I didn't have time to find anything too detailed. It seems like most of the time Disney reports it's park(s) earnings, they're all lumped together in some kind of "Disney Parks and Experiences" sum total without specifics. Though the reports I read did say that North American parks account for most of that (likely WDW over DLR).
The average attendance for 2019 at WDW was somewhere around 58,718,000 (all parks combined) and the same year DLR had 28,527,000 (again, both parks combined). Roughly half the attendance and roughly half the parks, makes sense to me. Also says to me that DLR is pulling it's weight. Disneyland beats out AK, HS and EP on the regular in terms of attendance (though likely not in terms of combined revenue).
While I don't have access to specific numbers earned from both coasts (again, WDW obviously makes more with more parks and experiences in general), DLR is still pulling it's weight in numbers and as the second most visited theme park in North America (beaten only by MK) I don't think it deserves to be considered "obsolete". Yeah, maybe it admittedly doesn't make as much money as the combined Florida parks but it probably makes a comparable amount relative to its size if the attendance numbers are anything to go off of. People are willing to go there and spend the money and max out the space, and even more would come if two more parks opened. WDW has that going for it while DLR doesn't. But again, not "obsolete". I don't think anyone higher up in TWDC would agree with that statement.
But I will personally agree that, yes, I also believe it to be better than the Florida parks. I love the Florida parks and there are things about them I do enjoy more than some things we have here but everything is so spread out that it feels thin at times. Meanwhile here in DL, they're trying to pack more quality over quantity into a smaller space because that's what they need to do. They don't as much luxury when it comes to space in SoCal.